Diesel engines G8T vehicle Renault Espace 3

G8T Diesel Engines — General Information
The in-line four-cylinder 12-valve diesel engine is mounted transversely at the front of the vehicle. The cylinder block is made of cast iron, and the cylinder head is made of aluminum alloy. The timing mechanism is...

G8T Diesel Engines — Technical Data
Engine type - G8T714, G8T716 Cylinder diameter, mm — 87 Piston stroke, mm — 92 Cylinder volume, cm³ — 2188 Compression ratio - 22:1 Maximum power: - CEE - 83 kW at 4500 min⁻¹ - DIN — 115 hp at 4500 min⁻¹ Maximum torque:...

Engine repair
Attention Removal the injectors does not require prior removal of the inlet manifold, provided that the Mot. 1383 Renault high-pressure pipe removal key with a 27 mm socket or the Renault Mot. 997 injector body removal...

Valve clearances
Due to the use of hydraulic tappets (valve clearance compensators) no need to check and adjust valve clearances. The only check is to check the condition of the clearance compensator surfaces and their sliding in the...

Cleaning the fuel system
Fig. 3.1. Fine fuel filter: 1 - fuel supply pipeline; 2 - fuel booster pump; 3 - air bleed bolt; 4 - fuel return pipeline; 5 - water drain bolt; 6 - fuel fine filter housing; 7 - Electric heater connector; 8 -...

Replacing the fine fuel filter
The fuel filter is equipped with an electric heater and a thermal switch that turns on the heater depending on the fuel temperature. The heater power is approximately 150 W The electric heater switches on when the fuel...

High pressure fuel pump
General description To comply with Euro 96 standards, ESPACE Turbo Diesel is equipped with the T.R.P - EGR system (preheating and postheating time delay and exhaust gas recirculation control). The high-pressure fuel...

Adjusting the injection timing of the high-pressure fuel pump
Raise the car on a lift so that the wheels hang freely in the air. Disconnect the cable from the negative battery terminal. Remove the right front wheel, the plastic mudguard covering the engine and the right front...

Injector body
Removal The nozzle assembly with the sprayer is screwed into the cylinder head. Removal the injectors does not require removing the intake manifold. Disconnect the cable from the negative battery terminal. Using the...

Checking the injector
Fig. 3.14. Location of the injector and glow plug in the pre-combustion chamber 1 - nozzle; 2 - nozzle assembly with sprayer; 3 - injector sealing ring in the cylinder head; 4 - flameproof washer; 5 - spray nozzle...

Glow plugs
The engine is equipped with ultra-fast glow plugs. The time it takes for the heating element to reach 850°C is within 3-7 sec depending on the spark plug characteristics. The spark plugs are equipped with a 5 mm...

Adjusting the high pressure fuel pump
Attention: It is strongly recommended to follow the sequence of adjustments. Adjusting Idle Speed and Idle Return Note: These adjustments must be made on a hot engine after the radiator fan has been turned on twice....

Replacing the load potentiometer
Removal Turn off the ignition. Disconnect the electrical connector from the load potentiometer. Remove the two screws and remove the load potentiometer. Installation Install a new potentiometer. Observe the installation...

Engine management system
Electrical power supply for the G8T 714 engine From the ignition switch, voltage is supplied to the A1 contact of the engine control unit. This circuit is protected by a 30 A fuse (F38). located in the passenger...

Control of engine preheating and postheating
Fig. 3.20. Location of various engine management system components and wiring harnesses in the engine compartment with the G8T 714 engine: 1 - Engine control unit; 2 - engine warm-up control unit; 3 - inertial shock...

KSB injection timing advance system
The KSB cold injection advance solenoid valve is controlled by the engine control unit. It is activated by applying voltage for at least 8 seconds after starting, then it is activated or deactivated depending on various...

ALFB Load Accounting System
The load dependent function (LFB) aims to convert the pressure into a voltage signal during deceleration and low load in order to reduce fuel consumption. The solenoid valve (AFLB), controlled by the engine control...

Fast Idle Control
The fast idle function is controlled by the electronic unit via the electromagnetic valve controlling the pneumatic capsule. This function is only available on vehicles equipped with air conditioning. When the ignition...

Exhaust Gas Recirculation (EGR) System
The EGR function is controlled by the electronic unit via a solenoid valve controlled by the cyclic opening law. The EGR valve is pneumatically controlled. Its opening is a function of the control electrical signal of...

Timing belt for gas distribution mechanism drive
Removal When removing the timing belt, you must use the following special tools: belt tension tester Mot 1273; centering fork of pendulum suspension travel limiter Mot. 1289-02; top Dead Center (TDC) Locking Meter Mot....

Timing belt tensioner roller
Removal Place the vehicle on a two-post lift and raise the front wheels off the ground. Disconnect the cable from the negative battery terminal. Remove: - right front wheel; - protective shields under the engine; -...

Auxiliary equipment drive belt
Cars with air conditioning Fig. 3.34. Location of the bolts for fastening the corrugated cover of the drive shaft to the differential flange Fig. 3.35. Fitting tools Mot. 1368, Mot. 1369 and Mot. 1376 for removing the...

Removal and installation of the G8T TURBO — PK1 engine
Removal Removal and installation are carried out on a two- or four-post lift, without removing: - front subframe; - bumpers; - front body panel; - a set of cooling system elements. Place the vehicle on a two-post lift...

Air supercharging — turbocharger
When working on a turbocharger, the following recommendations must be carefully observed: before unscrewing the parts, thoroughly clean the place where they are connected; place the removed parts on a clean, smooth...

Checking the boost pressure
Dynamic check Install a T-shaped adapter with a pressure gauge on the pneumatic channel of the air boost system capacity corrector. Place the pressure gauge in the car's interior. Conduct a road test under the following...

Pressure regulator
Removal Removal the pressure regulator requires removing the intake manifold, as well as the turbocharger heat shield. Remove the intake manifold and heat shield. Fig. 3.45. Location of collector heat-insulating screen...

Intake manifold
Removal Disconnect the cable from the negative battery terminal. Place the car on a lift and remove the front wheels. Disconnect, without removing, the oil cooler from the engine cooling system radiator. Be sure to make...

Exhaust manifold with turbocharger
Fig. 3.47. Location of the intake manifold mounting threaded studs Removal of the exhaust manifold, turbocharger or associated components requires preliminary removal of the power unit. When installing, it is necessary...

Cylinder head
Removal Removal of the cylinder head must be carried out on the engine removed from the vehicle. Remove the cap from the oil filler neck. Remove the timing belt of the gas distribution mechanism drive. Remove the power...

Cylinder head bolt tightening sequence
Pre-tightening Tighten all bolts to 20 Nm, then tighten to the angle shown in the table. Bolt number Angle ±2° Bolt length, mm 1. 5, 9, 13, 17 215 185 with a washer 2. 6. 10, 14, 18 240 185 without washer 3, 7,11,15 160...

Cylinder head repair
Disassembly Caution: When disassembling the cylinder head, make sure that all parts can be installed in their original places later. Remove the glow plugs. Remove the exhaust manifold and turbocharger. Using the Renault...

Engine repair — disassembly, inspection and assembly
Disassembly Remove the power unit from the vehicle. Remove the cylinder head. Disconnect the electrical connectors from the starter, unscrew the bolts and remove the starter. Remove the bolts securing the gearbox to the...

Lubrication system — general information
Cars use a pressure lubrication system for the engine. Oil from the oil pan is fed under pressure through a mesh filter and a fine filter by an oil pump. The oil pump is driven by a chain from the crankshaft. A bypass...

Oil pump
Fig. 3.70. Location of oil pump mounting bolts Removal Disconnect the cable from the negative battery terminal. Remove the plastic engine protection mudguard Drain the engine oil from the engine. Remove the oil pan...

Checking oil pressure
Disconnect the cable from the negative battery terminal. Remove the power steering fluid reservoir. Unscrew the high pressure line from the fuel injector of the first cylinder. Unscrew the oil pressure sensor and screw...

Cooling system
The closed cooling system consists of a water pump, a cross-flow radiator, a radiator fan with an electric cord, a thermostat, a heater core, hoses and sensors. The radiator fan with an electric cord is activated when a...

Cooling liquid
Aluminum radiators require the use of appropriate coolant. The GLACEOL type D coolant offered by the Renault network meets the technical requirements of the Research Centre, in particular: neutrality when interacting...

Checking the tightness of the cooling system
See the corresponding description in the section " F3R Petrol Engines ". Fig. 3.73. Coolant circulation diagram in the engine cooling system: 1 - right interior heating radiator; 2 - left interior heating radiator; 3 -...

Water pump
Removal Raise the car on a lift so that the wheels hang freely in the air. Disconnect the cable from the negative battery terminal. Remove the right front wheel, the plastic mudguard covering the engine and the right...

Draining the coolant
Fig. 3.75. Elements of the cooling system: 1 - expansion tank; 2 - housing for coolant; 3 - coolant temperature sensor; 4 - coolant temperature sensor for the gauge in the instrument cluster; 5 - water pump; 6 -...

Filling the cooling system and removing air
In the cooling system, there is no radiator tap heating system of the passenger compartment. The circulation of the coolant is constantly carried out through the radiators of the heating system, which thus participate...

Set of cooling system elements together with a radiator
Removal Removal of the cooling system kit together with the radiator of the G8T engine is similar to the procedure for the F3R engine, except for the following differences: - to lower the cooling system components kit...

Exhaust gas system
Fig. 3.78. Connection of the exhaust pipe of the exhaust system of vehicles with G8T engines: 1 - hairpin; 2 - ring Hairpins (1, Fig. 3.78) the exhaust pipe of vehicles with G8T engines has stops that determine the...

Noise in the exhaust system
To determine the source of the noise, a road test of the vehicle should be performed. Then the fault should be reproduced on a stationary vehicle. To do this, it is necessary to repeatedly and abruptly change the engine...

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